Sorry for the late answer. I put this project on hold for a while. But I settled with E6000 glue. It's recommended for ABS plastic and leather as well. Also, thing to consider that it needs time to cure so I can play with the leather and reposition it if I need to. Something that I can't do with contact glue.
I have already prepared the guitar case and probably I will do the leather molding after new year. There is so much I have to do focus on. I don't have time to do it earlier.